Energy-saving boiler combustion system of a material returning device for a solid waste boiler

Abstract

This application relates to the field of boilers, and more particularly to an energy-saving boiler combustion system for a return material device in a solid waste boiler. The system includes a boiler equipped with a cyclone separator for separating flue gas discharged from the boiler. The cyclone separator is equipped with a coal ash separation device for separating coal ash from the solid material separated by the cyclone separator. The coal ash separation device includes a coal ash separation box, which has a first ash outlet for discharging coal ash and an impurity outlet for discharging impurities. A first return material device is provided on the coal ash separation box to return the coal ash discharged from the first ash outlet back into the boiler. This application offers the following advantages.

Description

Technical Field

[0001] This application relates to the field of boilers, and more particularly to an energy-saving boiler combustion system for a return device for solid waste boilers. Background Technology

[0002] A boiler is an energy conversion device. The energy input to a boiler includes the chemical energy of fuel and electrical energy. The boiler outputs steam, high-temperature water, or organic heat carriers with a certain amount of thermal energy. A separator is often installed at the boiler's discharge port, and a return feeder is installed on the separator to feed the separated material back into the boiler for combustion.

[0003] The return feeder has the function of sending the materials separated by the separator back into the boiler. These materials include coal ash, gangue, and clay, thereby achieving material balance during combustion and regulating the temperature of the combustion materials. It also has the function of sealing the material and preventing the positive pressure flue gas in the boiler from flowing back into the negative pressure separator, causing a short circuit in the flue gas and affecting the normal operation of the separator.

[0004] Regarding the aforementioned technologies, the inventors believe that the following defects exist: In addition to coal ash, the materials separated by the separator also contain a large number of particulate impurities. Due to their large size, these particulate impurities are difficult to mix into the burning coal after being returned to the boiler by the return feeder, leading to their accumulation. This accumulation can affect the subsequent feeding of the return feeder and also cause uneven temperature distribution within the boiler, thus affecting its normal operation. Summary of the Invention

[0005] To address the issue of particulate matter impurities affecting the normal operation of boilers, this application provides an energy-saving boiler combustion system for a return material device in a solid waste boiler.

[0006] This application provides an energy-saving boiler combustion system for a solid waste boiler return device, which adopts the following technical solution:

[0007] An energy-saving boiler combustion system for a return material device in a solid waste boiler includes a boiler. The boiler is equipped with a cyclone separator for separating flue gas discharged from the boiler. The cyclone separator is equipped with a coal ash separation device for separating coal ash from the solid material separated by the cyclone separator. The coal ash separation device includes a coal ash separation box, which has a first ash outlet for discharging coal ash and an impurity outlet for discharging impurities. A first return material device is installed on the coal ash separation box to return the coal ash discharged from the first ash outlet back into the boiler.

[0008] By adopting the above technical solution, after the boiler discharges flue gas, the discharged flue gas will enter the cyclone separator. Under the action of centrifugal force in the cyclone separator, the heavier solid materials are separated from the flue gas and enter the coal ash separation box. Then, the coal ash is separated from the solid materials by the coal ash separation device and enters the first return feeder through the first ash outlet. Then, the first return feeder returns the material to the boiler, thereby realizing the return of coal ash and separating the larger gangue and clay. This ensures that only the lighter and smaller coal ash is returned to the boiler. Because of its small size, the coal ash can easily fill the gaps between the burning coal, thus playing a role in material balance and temperature regulation. It also separates gangue and clay, reducing the probability that gangue and clay will be difficult to fill between the coal and accumulate, thus affecting the normal operation of the boiler.

[0009] Optionally, the coal ash separation device further includes an air blowing box disposed at the bottom of the coal ash separation box. The air blowing box has several first air holes for air outlet. The first air holes are covered with a protective filter cloth for filtering materials. The first air holes are used to blow coal ash to the first ash outlet. Air pipes for air supply are disposed at both ends of the air blowing box. Several first baffles and second baffles are disposed inside the air blowing box. The first baffles are used to block and disperse the air blown in by the air pipes. The second baffles are staggered with the first baffles and are used to further disperse the air dispersed by the first baffles.

[0010] By adopting the above technical solution, air is supplied through an air pipe and then discharged from the material through the first air hole to blow away the coal ash, thereby separating the coal ash from the material in a convenient and quick manner. The gas blown out of the air pipe first impacts the first baffle in the air blowing box. The first baffle blocks the gas, and the gas flows along the side wall of the first baffle after being blocked, but the speed is reduced due to the obstruction. The gas flowing through the gap between the adjacent first baffles impacts the second baffle, and the second baffle blocks and slows down the gas a second time, thus reducing the gas velocity even further. This greatly reduces the gas velocity blown into the coal ash separation box, making the rise of coal ash more gentle, reducing the probability of coal ash spilling out and running around in the coal ash separation box due to excessive gas velocity, and also reducing the probability of excessive gas velocity obstructing the discharge of the cyclone separator.

[0011] Optionally, the coal ash separation box is provided with a vibrating inner box, and the vibrating inner box has a second ash outlet corresponding to the first ash outlet. The impurity outlet is also provided on the vibrating inner box, and the vibrating inner box also has a second air hole corresponding to the first air hole. The coal ash separation box is provided with a vibrating element, which is used to control the vibration of the vibrating inner box. The vibrating inner box is used to make the material in the coal ash separation box vibrate.

[0012] By adopting the above technical solution, the material is vibrated by the inner vibrating box, causing the gangue and clay to vibrate continuously. This creates gaps between the gangue and clay, allowing coal ash to pass through. This reduces the probability that individual gangue or clay pieces are tightly packed together without gaps, causing coal ash to block them and hindering coal ash separation. Furthermore, the vibration of the inner vibrating box causes the position between the second and first air holes to change continuously. The positional relationship between the second and first air holes changes between being connected and staggered, causing the vibrating inner vibrating box around the second air hole to block the opening of the first air hole. This further hinders the gas exiting from the first air hole and further reduces the gas flow rate.

[0013] Optionally, the coal ash separation box is also equipped with a clay separation device. The feed end of the clay separation device is connected to the impurity discharge port. The clay separation device is used to separate clay from granular materials.

[0014] By adopting the above technical solution, the gangue and clay after the coal ash is separated in the coal ash separation box enter the clay separation device through the impurity discharge port. The clay separation device separates the clay, thereby recycling and reusing the gangue and clay, which plays a role in saving resources.

[0015] Optionally, the clay separation device includes a clay separation box and a sliding assembly. The sliding assembly includes a first slide rail disposed opposite to the clay separation box, a slider slidably disposed between the first slide rails, a first driving member on the clay separation box for driving the slider to slide, a sliding groove on the slider, a low-pressure water gun slidably disposed on the sliding groove, and a second driving member on the slider for driving the low-pressure water gun to slide. The low-pressure water gun slides on the slider in a direction closer to or away from the first slide rail. The low-pressure water gun is used to break up and wet the clay. The sliding assembly is used to control the position of the low-pressure water gun to process the material in the clay separation box.

[0016] By adopting the above technical solution, in the clay and gangue in the clay separation box, a low-pressure water gun is used to break up the clay and add water. After the clay absorbs water, the water will penetrate into the gaps between the clay molecules, thereby softening the clay until it becomes fluid. The low-pressure water gun simultaneously adds water and breaks up the clay, accelerating the fluidization of the clay and thus achieving the separation of gangue and clay. The low-pressure water gun slides on the slider via a chute, and the slider slides within the clay separation box via the first slide rail, thereby realizing the displacement of the low-pressure water gun and expanding the rinsing range of the low-pressure water gun.

[0017] Optionally, the clay separation box is provided with a clay outlet for discharging clay and a gangue outlet for discharging gangue. The clay outlet is provided with a gangue filter screen for filtering gangue. The clay separation box is provided with a water circulation device. The inlet end of the water circulation device is connected to the clay outlet. The water circulation device includes a water circulation tank. The water circulation tank is provided with a clay filter cloth for filtering clay. A water storage chamber is formed in the water circulation tank for storing the water filtered by the clay filter cloth. The water circulation tank is provided with a water pressure drive for transferring the water in the water storage chamber to a low-pressure water gun.

[0018] By adopting the above technical solution, fluidized clay flows through the gangue filter screen into the water circulation device, while the gangue is blocked by the gangue filter screen and retained in the clay separation box. The clay is washed with a low-pressure water gun, which reduces the crushing of the gangue by the water pressure, resulting in a smaller gangue size and a lower probability of it passing through the gangue filter screen, making the separation of gangue and clay more thorough. The clay flowing into the water circulation box is filtered through the clay filter cloth, leaving the clay on the clay filter cloth, while the water flows through the clay filter cloth into the water storage chamber. Then, the water in the water storage chamber is forced into the clay separation box by the water pressure drive to supply the low-pressure water gun, thus achieving the function of water circulation, saving water resources, and playing an environmental protection role.

[0019] Optionally, the clay separation box is also equipped with a dryer for drying gangue, and the feed end of the dryer is connected to the discharge port of the gangue.

[0020] By adopting the above technical solution, the remaining gangue in the clay separation box is dried using a dryer, which facilitates subsequent processing.

[0021] Optionally, the dryer is equipped with a crusher for crushing gangue, the feed end of the crusher is connected to the discharge end of the dryer, and the crusher is equipped with a second return feeder, the feed end of the second return feeder is connected to the discharge end of the crusher, and the second return feeder is used to send the crushed gangue back to the boiler.

[0022] By adopting the above technical solution, the dried gangue is crushed by a crusher to reduce its size. Then, the crushed gangue is returned to the boiler through a second return feeder. Due to its small size, the crushed gangue can be easily mixed into the gaps between the coal, reducing the probability of gangue accumulation affecting the normal operation of the boiler. It also plays a role in material balance and temperature regulation together with coal ash. At the same time, after absorbing sufficient heat, the gangue can also burn to release heat, further saving resources. Utilizing the recycled gangue to provide heat, the gangue absorbs heat when it first enters the boiler. After absorbing sufficient heat, it releases the absorbed heat along with its own heat, thereby improving the combustion rate and the boiler's heating efficiency, making the boiler more efficient and energy-saving.

[0023] In summary, this application includes at least one of the following beneficial technical effects:

[0024] 1. It enables the return of coal ash, ensuring that only smaller coal ash is returned to the boiler. Due to its small size, the coal ash can easily fill the gaps between the burning coal, thus achieving material balance and regulating material temperature. It also separates gangue and clay, reducing the probability that gangue and clay will be difficult to fill between the coal and accumulate, thus affecting the normal operation of the boiler.

[0025] 2. By using a clay separation device to separate the clay, the gangue and clay can be recycled and reused, thus saving resources.

[0026] 3. The crushed gangue can be smoothly mixed into the gaps between the coal, reducing the probability that gangue accumulation will affect the normal operation of the boiler. It also plays a role in material balance and temperature regulation together with coal ash. At the same time, after the gangue absorbs enough heat, it can also burn to release heat, which further saves resources and makes the boiler more efficient and energy-saving. Attached Figure Description

[0027] Figure 1 This is a schematic diagram of the overall structure of an energy-saving boiler combustion system for a return material device for a solid waste boiler, as described in an embodiment of this application.

[0028] Figure 2 This is a schematic diagram of the exploded structure of the coal ash separation box.

[0029] Figure 3 This is a structural diagram highlighting the positional relationship between the first baffle and the second baffle.

[0030] Figure 4 This is a schematic diagram highlighting the structure of the second feed inlet.

[0031] Figure 5 This is a schematic diagram of a clay separation device.

[0032] Figure 6 This is a schematic diagram of the exploded structure of a clay separation box.

[0033] Figure 7 This is an exploded view of the sliding component.

[0034] Figure 8 yes Figure 7 A magnified structural diagram of point A in the middle.

[0035] Figure 9 This is a schematic diagram highlighting the filter pores.

[0036] Explanation of reference numerals in the attached drawings: 1. Boiler; 11. Cyclone separator; 12. First return feeder; 13. Second return feeder; 2. Coal ash separation device; 21. Coal ash separation box; 211. First feed inlet; 22. First ash outlet; 221. Impurity outlet; 23. Air blowing box; 231. First air hole; 24. Protective filter cloth; 25. Air pipe; 26. First baffle; 27. Second baffle; 3. Vibrating inner box; 31. Second ash outlet; 311. Second feed inlet; 32. Second air hole; 33. Vibrating component; 4. Clay separation device; 41. Clay separation box; 411. Clearance groove; 42. Sliding assembly; 43. First slide rail; 431. First driving component; 432. Second driving component; 44. Slider; 441. Slide groove; 442. First lead screw; 443. Base block; 444. Second lead screw; 445. First reversing gear; 446. Second reversing gear; 45. Low-pressure water gun; 46. Clay outlet; 461. Gangue outlet; 5. Water circulation device; 51. Water circulation tank; 511. Support plate; 512. Filter hole; 52. Clay filter cloth; 53. Water storage chamber; 54. Water pressure driving component; 541. Water supply pipe; 6. Dryer; 61. Crusher. Detailed Implementation

[0037] The following is in conjunction with the appendix Figure 1-9 This application will be described in further detail.

[0038] This application discloses an energy-saving boiler combustion system for a solid waste boiler return device. (Refer to...) Figure 1The energy-saving boiler combustion system for the return material device of solid waste boiler includes a boiler 1 and a base frame. A cyclone separator 11 is installed on the boiler 1 to separate the flue gas discharged from the boiler 1. The cyclone separator 11 has discharge ends at both the top and bottom. Under the centrifugal force of the cyclone in the cyclone separator 11, the lighter flue gas approaches the center of the cyclone and is discharged from the discharge end at the top of the cyclone separator 11, while the heavier solid materials are separated from the flue gas and discharged from the discharge end at the bottom of the cyclone separator 11 under their own gravity. The materials include coal ash, gangue and clay.

[0039] Reference Figure 2 A coal ash separation device 2 is installed on the base frame. The coal ash separation device 2 is used to separate coal ash from the solid material separated by the cyclone separator 11. The coal ash separation device 2 includes a coal ash separation box 21. The cyclone separator 11 is fixedly connected to the top of the coal ash separation box 21. The coal ash separation box 21 has a first feed port 211 for the solid material separated by the cyclone separator 11 to enter. The first feed port 211 is connected to the discharge end at the bottom of the cyclone separator 11 through a pipe.

[0040] Reference Figure 1 and Figure 2 The coal ash separation box 21 has a first ash outlet 22 for discharging coal ash and an impurity outlet 221 for discharging impurities. The first ash outlet 22 is located on the side wall of the coal ash separation box 21 near the top of the coal ash separation box 21 in the height direction. A first return feeder 12 is installed on the base frame. The feed end of the first return feeder 12 is connected to the first ash outlet 22 through a pipe. The first return feeder 12 is used to return the coal ash discharged from the first ash outlet 22 to the boiler 1.

[0041] Reference Figure 3 The coal ash separation device 2 also includes an air blowing box 23 fixedly connected to the bottom of the coal ash separation box 21. The outer walls of the air blowing box 23 are in contact with and fit against the inner wall of the coal ash separation box 21, and the dimensions of the outer walls of the air blowing box 23 are adapted to the dimensions of the cross-section of the inner wall of the coal ash separation box 21. Several first air holes 231 for air discharge are opened through the side wall of the air blowing box 23 facing the first feed inlet 211. The several first air holes 231 are evenly distributed, and the diameter of the cross-section of the first air holes 231 is less than 3 mm, making it difficult for large particles of material to pass through the first air holes 231 and enter the air blowing box 23.

[0042] Reference Figure 3A protective filter cloth 24 for filtering materials is fixedly connected to the inner wall of the first air hole 231. The protective filter cloth 24 covers the opening of the first air hole 231 and is located on the inner wall of the first air hole 231 away from the bottom of the air blowing box 23 to prevent material from accumulating in the first air hole 231 on the protective filter cloth 24. The first air hole 231 is used to blow coal ash to the first ash outlet 22. Several air pipes 25 for air intake are fixedly connected to both ends of the air blowing box 23. The air pipes 25 pass through the side wall of the coal ash separation box 21 and are connected to the air blowing box 23.

[0043] Reference Figure 3 The air blowing box 23 is fixedly connected with several first baffles 26 and second baffles 27. The several first baffles 26 are divided into two groups. The two groups of first baffles 26 correspond to the air pipes 25 at both ends of the air blowing box 23. The number of first baffles 26 in one group is the same as the number of air pipes 25 at one end of the air blowing box 23. The first baffles 26 in one group correspond one-to-one with the air pipes 25 at one end of the air blowing box 23, so that the side wall of the first baffle 26 used for wind protection faces the air outlet of the corresponding air pipe 25. The first baffle 26 is used to block and disperse the air blown in by the air pipe 25.

[0044] Reference Figure 3 The second baffle 27 is located between the two sets of first baffles 26, and the positions of several second baffles 27 correspond one-to-one with the gaps between the two first baffles 26 in the same set. That is, the second baffles 27 and the first baffles 26 are staggered. The second baffles 27 are used to further disperse the air dispersed by the first baffles 26.

[0045] Reference Figure 3 and Figure 4 A vibrating inner box 3 is installed inside the coal ash separation box 21. Material enters into the vibrating inner box 3, which is used to vibrate the material. There is a gap between the inner walls on both sides of the coal ash separation box 21 through which the air pipe 25 passes and the outer wall of the vibrating inner box 3 to provide vibration space. The vibrating inner box 3 slides and vibrates within the coal ash separation box 21 using the gap. The other two side walls of the coal ash separation box 21 in the height direction are in contact and fit against the outer wall of the vibrating inner box 3. A second feed port 311 is provided through the top of the vibrating inner box 3. The second feed port 311 corresponds to and is connected to the first feed port 211. The cross-sectional area of ​​the opening surface of the second feed port 311 is larger than that of the opening surface of the first feed port 211, so that when the vibrating inner box 3 vibrates, the opening surface of the second feed port 311 still covers the opening surface of the first feed port 211.

[0046] Reference Figure 3 and Figure 4A second ash outlet 31, corresponding to the first ash outlet 22, is provided on the side wall of the vibrating inner chamber 3. The cross-sectional area of ​​the opening surface of the second ash outlet 31 is larger than that of the opening surface of the first ash outlet 22. An impurity outlet 221 is also provided on the vibrating inner chamber 3, and the impurity outlet 221 on the vibrating inner chamber 3 is connected to the impurity outlet 221 on the coal ash separation box 21. A second air hole 32, corresponding to the first air hole 231, is provided through the bottom wall of the vibrating inner chamber 3. The diameter of the opening surface of the second air hole 32 is equal to the diameter of the opening surface of the first air hole 231.

[0047] Reference Figure 3 A vibrating element 33 is fixedly connected to the outer wall of the coal ash separation box 21. In this embodiment, the vibrating element 33 is a vibrating cylinder. The output shaft of the vibrating element 33 passes through the coal ash separation box 21 and is fixedly connected to the outer wall of the vibrating inner box 3. The output shaft of the vibrating element 33 is fixed to the outer wall of the vibrating inner box 3, which has a gap with the inner wall of the coal ash separation box 21. The vibrating element 33 is used to control the vibration of the vibrating inner box 3, and the output shaft of the vibrating element 33 performs telescopic vibration along the path of the vibrating inner box 3.

[0048] Reference Figure 4 The inner wall of the coal ash separation box 21 where the first ash outlet 22 is located and the outer wall of the vibrating inner box 3 where the second ash outlet 31 is located always remain in contact and fit together. The first ash outlet 22 and the impurity outlet 221 on the coal ash separation box 21 are opened on the same side wall, and the impurity outlet 221 on the coal ash separation box 21 is located near the top side wall of the blowing box 23, while the impurity outlet 221 on the vibrating inner box 3 is located near the bottom of the side wall.

[0049] Reference Figure 4 The bottom wall of the vibrating inner box 3 is inclined, and the impurity outlet 221 is located at the lowest end of the inclination. This allows the inclined bottom wall to guide the separated gangue and clay into the impurity outlet 221. The top wall of the air blowing box 23 is also inclined, so that the top wall of the air blowing box 23 matches the bottom wall of the vibrating inner box 3, and the top wall of the air blowing box 23 always provides support to the bottom wall of the vibrating inner box 3.

[0050] Reference Figure 4 The top wall of the vibrating inner box 3 is inclined, and the second ash outlet 31 is located at the highest point. The inclined top wall of the vibrating inner box 3 is used to guide the blown coal ash into the second ash outlet 31.

[0051] Reference Figure 1The base frame is also equipped with a clay separation device 4. The feed end of the clay separation device 4 is connected to the impurity discharge port 221 through a pipeline. A valve for controlling the flow of materials is installed on the pipeline. The valve is installed near the coal ash separation box 21. The clay separation device 4 is used to separate clay from granular materials.

[0052] Reference Figure 5 The clay separation device 4 includes a clay separation box 41 and a sliding component 42 installed inside the clay separation box 41. The feed end of the clay separation box 41 is located on the side wall of the sliding component 42 near the bottom of the clay separation box 41. The feed end of the clay separation box 41 is the feed end of the clay separation device 4, so as to reduce the probability of material hitting the sliding component 42 during feeding and causing damage to the sliding component 42.

[0053] Reference Figure 6 Two clearance grooves 411 are provided on the inner wall of the clay separation box 41. The two clearance grooves 411 are symmetrically provided on the inner walls of the clay separation box 41 facing each other, and the clearance grooves 411 extend along the width direction of the clay separation box 41 in a horizontal position. The sliding assembly 42 includes a first slide rail 43 fixedly connected to the inner wall of the clearance groove 411. The two first slide rails 43 correspond one-to-one with the two clearance grooves 411. The length direction of the first slide rail 43 extends along the extension direction of the clearance groove 411, and the width of the first slide rail 43 is less than the depth of the clearance groove 411, so that the first slide rail 43 is entirely embedded in the clearance groove 411.

[0054] Reference Figure 5 and Figure 7 and Figure 8 A slider 44 slides between two first slide rails 43. The two ends of the slider 44 are respectively embedded in the two first slide rails 43 along their length. A first driving component 431 is installed on the clay separation box 41 to drive the slider 44 to slide on the first slide rails 43. The first driving component 431 includes a first motor fixedly connected to the outer wall of the clay separation box 41. A first lead screw 442, which rotates coaxially, is fixedly connected to the rotating shaft of the first motor. The length of the first lead screw 442 extends along the length of the first slide rail 43. The rotating shaft of the first motor passes through the side wall of the clay separation box 41. The first lead screw 442 is inserted into the first slide rail 43 and threadedly connected to the end of the slider 44. A sealed bearing is fixedly connected to the rotating shaft of the first motor. The sealed bearing is embedded in the side wall of the clay separation box 41. The rotating shaft of the first motor is fixedly connected to the inner ring side wall of the sealed bearing, and the side wall of the clay separation box 41 is fixedly connected to the outer ring side wall of the sealed bearing.

[0055] Reference Figure 6 and Figure 7 and Figure 8 A groove 441 is provided on the slider 44, extending along the length of the slider 44 and perpendicular to the length of the first slide rail 43. The groove 441 is also located horizontally. A base block 443 slides on the groove 441, with its end inserted into the groove 441. The base block 443 slides along the length of the groove 441. A low-pressure water gun 45 for high-pressure water spraying is fixedly connected to the base block 443. In this embodiment, the pressure of the low-pressure water gun 45 is less than 300 Pa. The low-pressure water gun 45 slides on the slider 44 towards or away from the first slide rail 43. The low-pressure water gun 45 is used to break up and wet the clay. The sliding component 42 is used to control the position of the low-pressure water gun 45 to process the material in the clay separation box 41.

[0056] Reference Figure 8 A second driving member 432 is installed on the slider 44 to drive the base block 443 to slide on the slide groove 441. The second driving member 432 includes a second motor fixedly connected to the end of the slider 44. A second lead screw 444 rotates inside the slider 44. The length direction of the second lead screw 444 extends along the length direction of the slide groove 441 and passes through the slide groove 441. The second lead screw 444 is threadedly connected to the slider 44. A first reversing gear 445 is fixedly connected to the rotating shaft of the second motor, and a second reversing gear 446 that meshes with the first reversing gear 445 is fixedly connected to the end of the second lead screw 444. One end of the second lead screw 444 abuts against the inner wall of the slider 44, while the other end of the second lead screw 444 abuts against the first reversing gear 445 through the second reversing gear 446. The rotation of the second motor shaft drives the second lead screw 444 to rotate through the first reversing gear 445 and the second reversing gear 446, thereby causing the base block 443 to slide, and thus causing the low-pressure water gun 45 to move.

[0057] Reference Figure 1 and Figure 8 and Figure 9 The bottom wall of the clay separation box 41 has a clay outlet 46 for discharging clay, and the side wall of the clay separation box 41 has a gangue outlet 461 for discharging gangue. A gangue filter screen for filtering gangue is fixedly connected to the inner wall of the clay outlet 46, and the gangue filter screen covers the opening surface of the clay outlet 46. A low-pressure water gun 45 with a pressure of less than 300Pa is used to reduce the probability of gangue passing through the gangue filter screen after being crushed.

[0058] Reference Figure 1 and Figure 9A water circulation device 5 is installed on the base frame. The inlet end of the water circulation device 5 is connected to the clay outlet 46. The water circulation device 5 includes a water circulation tank 51. The inlet end of the water circulation tank 51 is located on the top wall of the water circulation tank 51, and the inlet end of the water circulation tank 51 is also the inlet end of the water circulation device 5. A support plate 511 is fixedly connected to the middle of the inner wall of the water circulation tank 51. The support plate 511 covers the internal cross section of the water circulation tank 51. Several filter holes 512 are opened through the support plate 511. A clay filter cloth 52 for filtering clay is covered on the support plate 511, and the clay filter cloth 52 covers all the filter holes 512.

[0059] Reference Figure 9 The water circulation tank 51 contains a water storage cavity 53 for storing water filtered by the clay filter cloth 52. The space between the bottom wall of the water circulation tank 51 and the side wall of the support plate 511 is the water storage cavity 53. A water pressure drive 54 is installed on the water circulation tank 51 to transfer the water in the water storage cavity 53 to the low-pressure water gun 45. The water pressure drive 54 includes a water supply pipe 541 fixedly connected to the water circulation tank 51. The water supply pipe 541 is connected to the water storage cavity 53, and the opening of the water supply pipe 541 is located near the bottom wall of the water storage cavity 53. A water pump is fixedly connected to the water circulation tank 51. The water supply pipe 541 passes through and is connected to the water pump. The water supply pipe 541 passes through the side wall of the clay separation box 41 and is connected to the low-pressure water gun 45, thereby supplying water to the low-pressure water gun 45.

[0060] Reference Figure 7 and Figure 9 The water circulation tank 51 has a cleaning port for workers to clean the clay on the clay filter cloth 52 or replace the clay filter cloth 52. A cleaning cover is fixedly connected to the water circulation tank 51 by bolts, and the side wall of the cleaning cover covers and seals the opening of the cleaning port.

[0061] Reference Figure 1 The base frame is also equipped with a dryer 6 for drying gangue. The feed end of the dryer 6 is connected to the gangue discharge port 461 via a pipe, and this pipe is controlled by a valve located near the gangue discharge port 461. The base frame is also equipped with a crusher 61 for crushing gangue. In this embodiment, the crusher 61 is used to crush the gangue to a fine or pulverized degree. The feed end of the crusher 61 is connected to the discharge end of the dryer 6. A second return feeder 13 is also installed on the base frame. The feed end of the second return feeder 13 is connected to the discharge end of the crusher 61, and the second return feeder 13 is used to return the crushed gangue to the boiler 1.

[0062] The implementation principle of an energy-saving boiler combustion system for a return material device in a solid waste boiler according to an embodiment of this application is as follows: When the boiler 1 discharges flue gas, the cyclone separator 11 separates the flue gas, causing the heavier solid materials in the flue gas to fall into the vibrating inner box 3 inside the coal ash separation box 21. At this time, the air pipe 25 blows air, and the first baffle 26 blocks and disperses the air blown out by the air pipe 25. At this time, part of the air is discharged upward along the side wall of the first baffle 26 from the first air hole 231, and then enters the vibrating inner box 3 through the second air hole 32. Part of the air leaks through the gap between the adjacent first baffles 26 and impacts the second baffle 27, causing the air to move upward along the second baffle 27 through the first air hole 231 and the second air hole 32 to vibrate the inner box 3. Part of the air leaks through the gap between the adjacent second baffles 27, and then this part of the air will collide with the air blown out from the air pipe 25 on the other side, and thus run upward.

[0063] The vibrating element 33 drives the vibrating inner box 3 to vibrate, thereby causing the material inside the vibrating inner box 3 to vibrate. The air blown out of the first air hole 231 carries the coal ash through the gaps created by the vibration between the gangue and clay. Then, guided by the inclined top wall of the vibrating inner box 3, it enters the second ash outlet 31, and then passes through the first ash outlet 22 and the first return feeder 12 to return to the boiler 1. The gangue and clay enter the clay separation box 41. The sliding component 42 moves the low-pressure water gun 45 to impact, break up and wet the clay, causing the clay to dissolve in the water and flow. Then, it enters the water circulation box 51 from the clay outlet 46. The clay and water are filtered out by the clay filter cloth 52, and the filtered water is then pressured back to the low-pressure water gun 45 by the water pressure drive component 54 for use.

[0064] After the clay is lost, the gangue is guided by the low-pressure water gun 45 and enters the dryer 6 from the gangue outlet 461 for drying. Then it enters the crusher 61 for crushing. Finally, the crushed gangue is returned to the boiler 1 through the second return feeder 13.

[0065] The above are all preferred embodiments of this application, and are not intended to limit the scope of protection of this application. Therefore, all equivalent changes made in accordance with the structure, shape and principle of this application should be covered within the scope of protection of this application.

Claims

1. An energy-saving boiler combustion system for a return material device in a solid waste boiler, comprising a boiler (1), characterized in that: The boiler (1) is equipped with a cyclone separator (11) for separating the flue gas discharged from the boiler (1). The cyclone separator (11) is equipped with a coal ash separation device (2). The coal ash separation device (2) is used to separate the coal ash in the solid material separated by the cyclone separator (11). The coal ash separation device (2) includes a coal ash separation box (21). The coal ash separation box (21) is provided with a first ash outlet (22) for discharging coal ash and an impurity outlet (221) for discharging impurities. The coal ash separation box (21) is equipped with a first return feeder (12). The first return feeder (12) is used to return the coal ash discharged from the first ash outlet (22) to the boiler (1). The coal ash separation box (21) is also equipped with a clay separation device (4). The feed end of the clay separation device (4) is connected to the impurity discharge port (221). The clay separation device (4) is used to separate the clay in the granular material. The clay separation device (4) includes a clay separation box (41) and a sliding assembly (42). The sliding assembly (42) includes a first slide rail (43) arranged opposite to each other in the clay separation box (41). A slider (44) is slidably arranged between the first slide rails (43). A first driving member (431) for driving the slider (44) to slide is provided on the clay separation box (41). A groove (441) is provided on the slider (44). A low-pressure water gun (45) is slidably arranged on the groove (441). A second driving member (432) for driving the low-pressure water gun (45) to slide is provided on the slider (44). The low-pressure water gun (45) slides on the slider (44) in a direction closer to or away from the first slide rail (43). The low-pressure water gun (45) is used to break up and wet the clay. The sliding assembly (42) is used to control the position of the low-pressure water gun (45) to process the material in the clay separation box (41). The clay separation box (41) is provided with a clay outlet (46) for discharging clay and a gangue outlet (461) for discharging gangue. The clay outlet (46) is provided with a gangue filter screen for filtering gangue. The clay separation box (41) is provided with a water circulation device (5). The feed end of the water circulation device (5) is connected to the clay outlet (46). The water circulation device (5) includes a water circulation box (51). The water circulation box (51) is provided with a clay filter cloth (52) for filtering clay. The water circulation box (51) is provided with a water storage chamber (53) for storing the water filtered by the clay filter cloth (52). The water circulation box (51) is provided with a water pressure drive (54) for transferring the water in the water storage chamber (53) to the low-pressure water gun (45).

2. The energy-saving boiler combustion system for a return material device in a solid waste boiler according to claim 1, characterized in that: The coal ash separation device (2) also includes an air blowing box (23) located at the bottom of the coal ash separation box (21). The air blowing box (23) has several first air holes (231) for air outlet. The first air holes (231) are covered with a protective filter cloth (24) for filtering materials. The first air holes (231) are used to blow coal ash to the first ash outlet (22). The two ends of the air blowing box (23) are provided with air pipes (25) for air supply. The air blowing box (23) is provided with several first baffles (26) and second baffles (27). The first baffles (26) are used to block and disperse the air blown in by the air pipes (25). The second baffles (27) are staggered with the first baffles (26). The second baffles (27) are used to disperse the air dispersed by the first baffles (26) a second time.

3. The energy-saving boiler combustion system for a return material device in a solid waste boiler according to claim 2, characterized in that: The coal ash separation box (21) is provided with a vibrating inner box (3). The vibrating inner box (3) is provided with a second ash outlet (31) corresponding to the first ash outlet (22). The impurity outlet (221) is also provided on the vibrating inner box (3). The vibrating inner box (3) is also provided with a second air hole (32) corresponding to the first air hole (231). The coal ash separation box (21) is provided with a vibrating element (33). The vibrating element (33) is used to control the vibration of the vibrating inner box (3). The vibrating inner box (3) is used to make the material in the coal ash separation box (21) vibrate.

4. The energy-saving boiler combustion system for a return material device in a solid waste boiler according to claim 1, characterized in that: The clay separation box (41) is also equipped with a dryer (6) for drying gangue, and the feed end of the dryer (6) is connected to the gangue discharge port (461).

5. An energy-saving boiler combustion system for a return material device in a solid waste boiler according to claim 4, characterized in that: The dryer (6) is equipped with a crusher (61) for crushing gangue. The feed end of the crusher (61) is connected to the discharge end of the dryer (6). The crusher (61) is equipped with a second return feeder (13). The feed end of the second return feeder (13) is connected to the discharge end of the crusher (61). The second return feeder (13) is used to send the crushed gangue back to the boiler (1).

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